27 docs tagged with "senior"

Authentication vs authorization, sessions vs JWT, OAuth and OIDC

Sessions in cookies, Data Access Layer, Proxy, protecting Server Actions

OAuth and OIDC in the system browser, expo-auth-session and react-native-app-auth, native Apple and Google sign-in, token lifecycle and refresh, biometric login

Cache Components and 'use cache', the previous caching model, revalidation, what changed in 15 and 16

Using all CPU cores with cluster, how workers share a port, scaling with PM2 or containers

Transitions, useDeferredValue, Suspense and use

Content-Security-Policy header, directives and source values, strict CSP with nonces and strict-dynamic, Report-Only, frame-ancestors

The critical rendering path, render-blocking resources, resource hints and fetchpriority, images, fonts, compression and caching

Creational, structural and behavioral design patterns with frontend examples, Observer vs Pub/Sub, Factory Method vs Simple Factory

How memory is freed in JavaScript and where leaks come from

Threat model of a mobile app, OWASP MASVS and Mobile Top 10, what the bundle reveals, HTTPS and SSL pinning, root detection vs attestation, sensitive data on screen and in logs, WebView

Turbo Native Modules, Expo Modules API and Nitro Modules, Codegen spec, sync vs async methods, events, Fabric Native Components, config plugins

NetInfo and expo-network, isConnected vs isInternetReachable, cached reads, queued writes, offline-first, TanStack Query onlineManager and focusManager, conflicts and idempotent requests

When to optimize, component structure, memo, useMemo, useCallback and React Compiler

Why a React Native app lags, the frame budget of the JS and UI threads, measuring in release builds, common causes and fixes, startup time

createRoot, hydrateRoot, hydration, StrictMode and flushSync

Render and commit phases, virtual DOM, diffing heuristics and Fiber

When rAF and idle callbacks run in a frame, scheduler.yield() and postTask, which one to use for animation, background work and long tasks

REST vs GraphQL - over- and under-fetching, caching, errors, N+1, versioning, and where tRPC fits

'use server', forms and useActionState, validation, revalidation, why an action is a public endpoint

RSC vs SSR, what Server Components can't do, static and dynamic rendering, streaming, hydration

Service worker as a network proxy, registration and scope, lifecycle and updates, caching strategies, offline and PWA

The five SOLID principles with frontend interpretations and TypeScript examples

keyof, typeof, indexed access, mapped, conditional and template literal types, infer

Custom elements, Shadow DOM, templates and slots, what crosses the shadow boundary, Declarative Shadow DOM, forms, Web Components with frameworks

Actions, use, ref as a prop and other changes of React 19 and its minor versions; removed APIs and migration

Worker threads for CPU-heavy work, messaging and shared memory, thread pools, worker_threads vs cluster and child_process